LED bulb



FIG. 1 is a front view of the LED bulb, the rear view being identical to the front view;

FIG. 2 is a side view thereof, the left side view and the right side view being identical;

FIG. 3 is a top view thereof; and,

FIG. 4 is a perspective view thereof.

The broken lines depict environmental subject matter only and form no part of the claimed design. 

CLAIM The ornamental design for a LED bulb, as shown and described. 